How To Calculate Vessel Depressurization Time With Quick & Simple Logic

VMAC recently received a message from a process engineer in London who had a great question after reading our How to Work Out ‘Time To Fill’ Type Questions Using Simple Logic article. The process engineer asked:

“I was wondering if you have a similar calculation that you could share for “How to Calculate the Depressurization Time”? For instance, I have a pipe section at a certain pressure and I depressurize it to certain lower pressure through a 1″ hole (via a 1″ valve). How long would it take the pipe section to reduce pressure from P1 to P2?”

Continue reading “How To Calculate Vessel Depressurization Time With Quick & Simple Logic”

What are Dual Tower Regenerative Desiccant Air Dryers (and how do they work?)

Heaterless Type (Pressure Swing Dryers)

Dual tower desiccant air dryers are used to produce dewpoint temperatures below the freezing point of water, as well as reduce the moisture content of compressed air used in critical process applications. Typical dewpoints produced by these types of dryers are -40° F to -100° F, although lower dewpoints are possible. Continue reading “What are Dual Tower Regenerative Desiccant Air Dryers (and how do they work?)”

ACFM (Actual Cubic Feet per Minute) vs. SCFM (Standard Cubic Feet per Minute)

The air compressor industry is full of acronyms for measuring airflow or consumption.  Two common measurements are ACFM and SCFM.

ACFM (Actual Cubic Feet per Minute) may have different definitions depending on the industry.  VMAC defines ACFM as the true air mass flow given a certain set of real life conditions.  A pneumatic tool may demand a specific minimum air mass flow for it to perform properly on the job site.  ACFM varies depending on atmospheric conditions on the job site.

Continue reading “ACFM (Actual Cubic Feet per Minute) vs. SCFM (Standard Cubic Feet per Minute)”

Most Common Compressed Air Drying Methods

As mentioned in previous articles, when compressing air, liquid is also brought into the air stream.  When cooling, that liquid condenses and is delivered with the compressed air to your tool or application.  There are a number of ways of removing or reducing the amount of liquid in the air stream.  These include:

  • Storage Tank Cooling Method
  • After-cooling
    • Air-cooled versions
    • Water Cooled Versions
  • Absorption Drying
  • Adsorption Drying

This article will go into the details of each drying method.

Continue reading “Most Common Compressed Air Drying Methods”

Keeping Your Cool: Managing the heat rejection requirements of your air compressor system

If you’ve determined what size of compressor you need and the engine requirements to power that compressor the next important step is to ensure that the combination is going to operate optimally in your working environment.  In the case of mobile compressors this may include high altitudes, dirty environments and large ambient air temperature fluctuations.  For this article, we will focus on the different methods of rejecting the heat generated by your compressor system. Continue reading “Keeping Your Cool: Managing the heat rejection requirements of your air compressor system”

How inlet temperature affects air flow

It is important to consider where your compressor air intake is located. Some factors to consider are: particulates in the air (dust which can plug filters), ingestion potential (can the intake become plugged with snow or mud) and the temperature of the air when it enters the compressor.  If you are mounting an air compressor to an internal combustion engine and/or in any type of enclosure the ambient air temperature around the compressor can rise well above the outside ambient temperature causing a reduction in compressor performance. Continue reading “How inlet temperature affects air flow”

Why does my compressor system perform differently at higher altitudes?

Anyone who has had to use a compressor at a high altitude knows how frustrating it can be. Compressor performance is degraded and it can take a lot longer to complete tasks. People who move to or work in areas that are at a higher altitude are often surprised when their compressor seems to be working slower than normal.

How an Air Compressor System Works

Mobile air compressor systems commonly in use typically consist of a gas or diesel engine powering an air compressor. When you turn on an air compressor system, it draws in ambient air through the compressor intake and compresses it to a smaller volume. This compressed air can then be stored in a storage tank or used to directly power your tools and equipment. Once the air storage is full or the tools being used are no longer running, the compressor stops drawing in and compressing air by either shutting off the engine and compressor or entering some sort of a standby mode.
Continue reading “Why does my compressor system perform differently at higher altitudes?”